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AD5111 is broken?



		

			

									
					    Nun2K
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 15, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello.
    

    I designed our product by applying AD5111 (10K, Up/Down).
    It worked normally once or twice, but it is currently fixed at A-W 45 ohm and W-B 9.8K ohm, and does not respond to any commands.
    Sometimes when power is applied again, it becomes A-W 9.8K ohm, W-B 39 ohm.
    The strange thing is that the resistance of A-B is measured around 9.8K.
    Judging by the resistance value, it doesn't seem like a malfunction. What's the problem?
    

    PS - Of course, other AD5111s are operating normally when tested by connecting them to the same signal port.
    

    Thanks in advance for your kind reply.
    

    
										

    
				Title errata correction
    
[edited by: Nun2K at 5:38 AM (GMT -4) on 15 Apr 2022]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Apr 18, 2022 4:29 AM
            
            
					
      
	
      

		
		
      
					
      Please share the circuit diagram and the power supply sequencing details.
      

      Does the part respond to U/D state?
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Apr 19, 2022 3:26 PM
            
            
												
						in reply to vsethia
					
									
        
	
        

		
		
        
					
        Hi, vsethia.
        

        Thank you for your kindness.
        I answer your question as follows.
        

        1. Please share the circuit diagram and the power supply sequencing details.
        

        

        -> Power is supplied directly from AD/DC 5V power.
        The sensor signal(A/sens_2, W/sens_1, B/sens_3) connection is controlled using the photo relay (control line SW_COMP_VDIV-FCC).
        (Of course, SW_COMP_VDIV-FCC is maintained High level at initial and normal.)
        

         
        

        Can the power supply sequencing have a critical effect on the behavior of a part?
        

        

        2. Does the part respond to U/D state?
        

          -> In U/D state, parts do not respond.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Apr 20, 2022 5:48 AM
            
            
												
						in reply to Nun2K
					
									
        
	
        

		
		
        
					
        Until the AD5111 is powered up, the relay control SW_COMP_VDIV_FCC is set to high (5V) and no signals are applied on A, W, B terminals. Is that correct?
        

        What are the voltages on the sens_1, sens_2 and sens_3 signals?
        

        What is the SW_COMP_VDIV_FCC when you try to turn on the relays.?
        

        What is the state of /CS and SCLK when you try to update the wiper position?
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Apr 25, 2022 4:39 AM
            
            
												
						in reply to vsethia
					
									
          
	
          

		
		
          
					
          Until the AD5111 is powered up, the relay control SW_COMP_VDIV_FCC is set to high (5V) and no signals are applied on A, W, B terminals. Is that correct?
          

            -> Yes.
          

          What are the voltages on the sens_1, sens_2 and sens_3 signals?
          

            -> sens_2 = 0.2V, sens_3 = 0V (GND), sens_1 = 0.193V ~ 0.027V
          

          What is the SW_COMP_VDIV_FCC when you try to turn on the relays.?
          

            -> If it means the control signal voltage level of SW_COMP_VDIV_FCC at relay turn on, it is changed to High(5V) -> Low(0V).
          

                On the other hand, it is changed to Low(0V) -> High(5V) at relay turn off.
          

          What is the state of /CS and SCLK when you try to update the wiper position?
          

            ->  /CS is Low and /CLK is High -> Low
          

          

          I have a question.
          If a signal is connected to another port before power is applied to VDD/GND, can AD5111 be broken?
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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          •  Analog Employees  
          
            
			                            
                        
                on Apr 25, 2022 9:22 AM
            
            
												
						in reply to Nun2K
					
									
          
	
          

		
		
          
					
          On your last query, please elaborate with a circuit diagram.
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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